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