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