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