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