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