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