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