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