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