Full list of all 96 UnderMine achievements.
The base game contains 94 achievements, and there is 1 DLC pack containing 2 achievements.
Transmuted 3 Relics at the same time using Transmutagen
Spawned a secret shop, in a secret shop, in a secret shop
Lifted the Summoning Stone 10 times
Discovered the Othermine
Learned 10 new blessings
Held 3 of the same potion at the same time
Fully upgraded the bombs
Fully upgraded the pickaxe
Bought every item in a fully expanded shop
Completely expanded the Pilfer shop
Fully upgraded the tunic
Crafted 30 new relics
Died with an Elixir in your inventory
Fully upgraded the gloves
Fully upgraded the goldsack
Lifted the Summoning Stone for the first time
Defeated Seer, World's Heart
Defeated Selt, Mortar, and Noori with the same peasant
Entered the Golden Core
Defeated Ponzu, Scaled Assembly
Held 99 bombs at once
Held 99 keys at once
Crafted 10 new potions
Fully expanded the potion slots
Fully upgraded the counter weight
Crafted 20 new relics
Healed 1,000 hp using food in one run
Entered the Shimmering Caverns
Defeated Noori, Spectre of Darkness
Found all 3 dogs in the UnderMine
Discovered the Golden Idol
Died 100 times
Peeped 100 skeletons
Defeated Mortar, Charged Golem
Spent 100,000 gold at shops
Thwarted 500 pilfers
Had something popcorn 5 times in a row
Completely expanded Dibble's shop
Crafted 10 new relics
Entered the Halls of Din
Entered the Halls of Din before defeating Mortar
Expanded the potion slot once
Rescued Kurtz
Defeated a Hoarding Pilfer
Spent 50,000 gold at shops
Lost 5,000 gold to pilfers
Died 50 times
Learned a new blessing
Rescued Lillyth
Defeated the Dungeon Gargoyles
Joined the Pilfer Loyalty Program
Ate cooked food for the first time
Crafted a new potion
Rescued Dibble
Assisted Beltrame
Cleansed a curse for the first time
Destroyed 20 signs
Spent 10,000 gold at shops
Peeped 10 skeletons
Entered the Delvemore Dungeon
Defeated Selt, Lord of Sand
Died 10 times
Crafted a new relic
Stole an item from the shop
Met Black Rabbit
Rescued Dodson
Defeated the Rockpile Mimic
Discovered a secret room
Rescued Wayland
Put yourself out in water
Had 6 curses active at the same time
Discovered a secret floor
Entered the Delvemore Dungeon before defeating Selt
Defeated Selt, Lord of Sand without upgrades
Defeated Noori, Spectre of Darkness without upgrades
Defeated Mortar, Charged Golem without upgrades
Defeated Ponzu, Scaled Assembly without upgrades
Lifted the Summoning Stone 30 times
Completed a run of the Othermine
Completed 3 runs of Othermine without dying
Completed an Othermine run without upgrades from the antechamber chest or shops
Defeated Seer, World's Heart without upgrades
Entered the Golden Core before defeating Ponzu
Completed a run with at least 2 hexes