Here is the full list of all 60 Legend of Grimrock 2 achievements.
Complete the game with hard difficulty setting
Complete the game with old school mode
Complete the game with Ironman and Single-use Crystals modes turned on
Reach level 10 with a farmer
Summon the Viper Roots in under 6 minutes
Enter the Nexus
Polymorph 10 times
Visit all levels
Find all secrets
Enter the Shrine of Balance
Defeat the Lindworm
Enter the Castle
Catch 25 fish
Collect and wear full set of Meteor armor (6 pieces)
Collect and wear full set of Crystal armor (6 pieces)
Collect and wear archmage's uniform (4 pieces)
Max out three skills
Assemble the Meteor Hammer
Enter the Crystal Mines
Collect four elemental essences
Find the Relic
Dig up all treasure chests
Defeat a Magma Golem
Learn 15 spells
Find the pie
Enter the Pyramid of Umas
Defeat the Wormbound brothers
Find 50 secrets
Find Bane
Find 8 skulls
Perform 500 missile or throwing weapon attacks
Cast 500 spells
Kill a monster with a single blow
Open the gate to the Cemetery
Defeat Herder's Den
Mix a total of 50 potions
Defeat the Ratling Boss
Kill 250 monsters
Dive 250 tiles
Collect and wear rogue's wardrobe (5 pieces)
Open 5 gold locks
Defeat a monster with a backstab attack
Open the door to the Archives
Cast 250 Spells
Max out a skill
Travel 10000 tiles
Perform 100 power attacks
Find 25 secrets
Kill a monster by teleporting on it
Defeat the Summon Stones
Visit 10 levels
Mix a total of 10 potions
Dig up three treasure chests
Collect an elemental essence
Find 10 secrets
Perform 500 melee weapon attacks
Cast 25 spells
Kill a monster by throwing pants at it
Defeat the Viper Roots
Deal a killing blow with unarmed attack