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