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