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