Here is the full list of all 221 Army of Ruin achievements.
Forge I - Complete the Stage without purchasing any Upgrade
Glacier III - Complete the Stage with no Capacity Upgrades
Forest II - Complete the Stage spending 5,000 or less in Upgrades
Graveyard III - Complete the Stage spending 20,000 or less in Upgrades
Graveyard II - Complete the Stage without taking any damage
Forest III - Complete the Stage without taking any damage
Glacier I - Complete the Stage without taking any damage
Upgrade Command Baton to Level 5
Forge II - Complete the Stage with 22:00 minutes or more on the clock
Shrine III - Complete the Stage with 28:00 minutes or more on the clock
Forge III - Complete the Stage without opening any chest
Upgrade Hitman Goggles to Level 5
Shrine II - Complete the Stage without opening any chest
Upgrade Anvil of Heaven to Level 5
Forest I - Complete the Stage with 16:00 minutes or more on the clock
Upgrade Pirate Cutlass to Level 5
Shrine ∞ - Reach Minute 30
Glacier Stage ∞ - Reach Minute 30
Upgrade Jade Wand to Level 5
Reach Experience Level 40 with Samael
Forge Stage ∞ - Reach Minute 30
Upgrade Silvan Shell to Level 5
Forest Stage ∞ - Reach Minute 30
Reach Experience Level 40 with Azazel
Upgrade Chain Lightning to Level 5
Reach Experience Level 30 with Nekros
Upgrade Dark Staff to Level 5
Graveyard Stage ∞ - Reach Minute 30
Reach Experience Level 40 with Midas
Upgrade Living Paintbrush to Level 5
Upgrade Brittle Stone to Level 5
Forge Stage I - Ruin 1 - Complete the Stage with Lanyz
Shrine I - Complete the Stage without moving
Shrine III - Ruin 3 - Evolve 3 weapons with Abaddon
Glacier Stage III - Ruin 3 - Pick 3 Charms with Kroat
Glacier Stage II - Ruin 3 - Earn 5,000 Coins with Neptune
Reach Experience Level 30 with Michi
Upgrade Throwing Bombs to Level 5
Unlock 200 items (Characters, Equipment and Features)
Upgrade Swift Tornado to Level 5
Glacier Stage II - Ruin 2 - Complete the Stage with Tisha and Explosive Flask,Seal of Purity
Upgrade Battle Cog to Level 5
Glacier II - Complete the Stage without moving
Forest Stage II - Ruin 1 - Complete the Stage with Bhask
Upgrade Unfulfilled Promises to Level 5
Upgrade Caltrops to Level 5
Glacier Stage I - Ruin 1 - Complete the Stage with Obsidian Crown
Glacier Stage I - Ruin 3 - Evolve 3 weapons with Kyros
Forge Stage II - Ruin 3 - Upgrade Panacea to Level 5
Forest Stage II - Ruin 3 - Earn 4,000 Coins with Saul
Forest Stage I - Ruin 3 - Complete the Stage with Voodoo Doll
Reach Experience Level 30 with Diana
Upgrade Bronze Starfish to Level 5
Upgrade Divine Top to Level 5
Graveyard I - Complete the Stage without moving
Reach Experience Level 25 with Tabia
Upgrade Marksman's Crossbow to Level 5
Shrine II - Complete the Stage with Rotting Coil,Poison Root,Elven Bow
Reach Experience Level 40 with Neptune
Upgrade Ink Geyser to Level 5
Shrine III - Complete the Stage infusing Wind Wind Wind
Shrine III - Complete the Stage without infusing any Earth
Shrine III - Ruin 1 - Complete the Stage with Magic Needle
Forest Stage III - Ruin 1 - Defeat all special bosses with Lanyz
Upgrade Promethean Flames to Level 5
Graveyard Stage III - Ruin 1 - Complete the Stage with Ker
Graveyard Stage III - Ruin 3 - Defeat all special bosses with Obsidian Crown
Graveyard Stage III - Ruin 2 - Defeat all special bosses with Experiment XIX
Reach Experience Level 40 with Experiment XIX
Upgrade Sparksword to Level 5
Glacier Stage III - Complete the Stage without infusing any Earth
Reach Experience Level 40 with Abaddon
Upgrade Sphere of Destruction to Level 5
Glacier Stage III - Ruin 2 - Reach Experience Level 35 with Bhask
Reach Experience Level 25 with Kroat
Upgrade Ominous Gale to Level 5
Upgrade Lapis Sword to Level 5
Shrine II - Ruin 2 - Defeat all special bosses with Samael
Shrine II - Ruin 1 - Complete the Stage with Onyx Coin
Glacier Stage III - Earn 4,000 Coins with Homemade Explosives
Glacier Stage III - Ruin 1 - Complete the Stage with Frozen Shard
Forest Stage III - Ruin 2 - Defeat all special bosses with Bhask
Upgrade Chain Shot to Level 5
Upgrade Magatama to Level 5
Reach Experience Level 30 with Traxx
Forge Stage III - Ruin 2 - Complete the Stage with Mork, and infuse Fire Fire Fire
Forge Stage III - Ruin 3 - Complete the Stage with Toxic Stench
Upgrade Frozen Shard to Level 5
Unlock 150 items (Characters, Equipment and Features)
Shrine I - Ruin 1 - Complete the Stage with Devilish Eye
Graveyard Stage III - Reach Experience Level 30 with Ker
Forge Stage I - Ruin 2 - Complete the Stage with Ice Mirror
Forge Stage I - Ruin 3 - Complete the Stage with Pirate Anchor
Upgrade Wanderer's Lantern to Level 5
Upgrade Landslide to Level 5
Shrine II - Complete the Stage infusing Ice Ice Ice
Forge Stage III - Upgrade Leather Bracer to Level 5
Forge Stage III - Ruin 1 - Complete the Stage with Ancestral Razor
Forge Stage III - Upgrade Golden Trident to Level 5
Glacier Stage II - Complete the Stage with War Drums
Glacier Stage II - Ruin 1 - Complete the Stage with Supply Crate
Forest Stage II - Ruin 2 - Complete the Stage with Buckler
Forest Stage III - Ruin 3 - Reach Experience Level 40 with Tisha
Graveyard Stage II - Ruin 3 - Kill 7500 enemies
Upgrade Mighty Punch to Level 5
Reach Experience Level 25 with Mork
Forge Stage II - Ruin 2 - Complete the Stage with Jellyfish Ashes
Forge Stage II - Reach Experience Level 30 with Saul
Forge Stage II - Ruin 1 - Defeat all special bosses with Ogol
Forge Stage II - Reach Experience Level 30 with Ogol
Reach Experience Level 25 with Tisha
Upgrade Cupid's Arrow to Level 5
Graveyard Stage I - Ruin 3 - Reach Experience Level 30 with Lanyz
Graveyard Stage I - Ruin 2 - Complete the Stage with Whirlwind Pickaxe
Graveyard Stage II - Ruin 2 - Defeat all special bosses with Ker
Upgrade Flintlock Pistols to Level 5
Upgrade Pirate Anchor to Level 5
Graveyard Stage I - Ruin 1 - Complete the Stage with Viking Helm
Upgrade Ancestral Razor to Level 5
Glacier Stage I - Ruin 2 - Complete the Stage with Selina, without infusing any Darkness
Forge Stage I - Upgrade Magnifier to Level 5
Forge Stage III - Complete the Stage
Upgrade Fiendish Tear to Level 5
Pick 3 Charms
Shrine III - Complete the Stage
Earn 30 Stars
Glacier Stage I - Reach Experience Level 25 with Ogol
Glacier Stage III - Complete the Stage
Upgrade Fire Wings to Level 5
Upgrade Homemade Explosives to Level 5
Shrine II - Complete the Stage
Glacier Stage II - Evolve Necromancer Gauntlets
Glacier Stage II - Complete the Stage
Upgrade Magical Slingshot to Level 5
Upgrade Jellyfish Ashes to Level 5
Forge Stage II - Complete the Stage
Pick 1 Charms
Forest Stage III - Upgrade Ranger Bow to Level 5
Reach Experience Level 15 with Ker
Upgrade Ranger Bow to Level 5
Forest Stage III - Complete the Stage
Forest Stage III - Complete the Stage with Meteorite Blast
Unlock 100 items (Characters, Equipment and Features)
Graveyard Stage III - Complete the Stage
Evolve 4 weapons
Earn 21 Stars
Earn 20 Stars
Graveyard Stage III - Complete the Stage with Storm Javelin
Reach Experience Level 15 with Bhask
Upgrade Blaze to Level 5
Forest Stage II - Upgrade Armor of Thorns to Level 5
Unlock 60 pieces of equipment (Weapons and Trinkets)
Earn 18 Stars
Forest Stage II - Complete the Stage with Energy Bolt
Use your skill 200 times through all stages
Reach Experience Level 25 with Kyros
Upgrade Fire Staff to Level 5
Die a total of 10 times
Graveyard Stage II - Ruin 1 - Defeat all special bosses with Ariana
Defeat 100 bosses through all stages
Graveyard Stage II - Upgrade Travel Boots to Level 5
Earn 17 Stars
Forest Stage I - Ruin 1 - Defeat all special bosses with Saul
Earn 16 Stars
Forest Stage I - Upgrade Volcanic Orbs to Level 5
Upgrade Volcanic Orbs to Level 5
Earn 15 Stars
Forest Stage II - Complete the Stage
Upgrade Golden Trident to Level 5
Upgrade Meteorite Blast to Level 5
Upgrade Mystical Firecrackers to Level 5
Use the Bomb Power 10 times through all stages
Graveyard Stage II - Complete the Stage with Magic Staff
Graveyard Stage II - Complete the Stage
Upgrade Necromancer Gauntlets to Level 5
Earn 12 Stars
Shrine I - Upgrade Ice Tear to Level 5
Shrine I - Upgrade Wolf's Fang to Level 5
Upgrade Energy Bolt to Level 5
Upgrade Whirlwind Pickaxe to Level 5
Use the Freeze Power 10 times through all stages
Earn 30,000 Coins through all stages
Use the Haste Power 10 times through all stages
Unlock 50 items (Characters, Equipment and Features)
Upgrade Ghostly Trail to Level 5
Earn 10 Stars
Upgrade Storm Javelin to Level 5
Shrine I - Complete the Stage
Win a total of 6 stages
Die a total of 5 times
Earn 8 Stars
Earn 20,000 Coins through all stages
Glacier Stage I - Complete the Stage
Glacier Stage I - Upgrade Toxic Stench to Level 5
Reach Experience Level 15 with Lanyz
Upgrade Spectral Dagger to Level 5
Upgrade Toxic Stench to Level 5
Upgrade Quicksilver Spears to Level 5
Forge Stage I - Earn 750 Coins
Use your skill 15 times
Upgrade Throwing Axe to Level 5
Forge Stage I - Complete the Stage
Upgrade Wolf's Fang to Level 5
Reach Experience Level 15 with Ogol
Graveyard Stage I - Upgrade Crawling Root to Level 4
Earn 5 Stars
Upgrade Magic Staff to Level 5
Upgrade Crawling Root to Level 5
Earn 500 Coins
Open 5 Chests
Upgrade Dragon Heart to Level 5
Reach Experience Level 15 with Saul
Forest Stage I - Complete the Stage
Forest Stage I - Complete the Stage with Throwing Axe
Earn 5,000 Coins through all stages
Earn 2 Stars
Graveyard Stage I - Reach Experience Level 20 with Ariana
Reach Experience Level 25
Kill 3000 enemies
Graveyard Stage I - Complete the Stage
Reach Experience Level 15 with Ariana