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