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