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