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