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