Here is the full list of all 56 Grim Clicker achievements.
Kill 500 champions
Kill 10000 fireflies
Click 50000 times
Kill 20 bosses
Reach Zone 50
Complete 100 quests
Complete 50 quests
Perform 50 rituals
Perform 20 rituals
Perform 10 rituals
Kill 1000 fireflies
Remove three locks
Complete 10 quests
Kill 10 bosses
Click 5000 times
Upgrade any item
Open 30 chests
Kill 5 bosses
Upgrade weapon to quality 15
Upgrade weapon to quality 10
Upgrade weapon to quality 5
Upgrade any weapon
Dissasemble any item
Find people on the shard
Kill 25 champions
Open 3 boss chests
Open 20 chests
Open shard chest
Get 20 wisdom
Get 15 wisdom
Get 10 wisdom
Get 20 dexterity
Get 15 dexterity
Get 10 dixterity
Get 20 strenght
Get 10 strenght
Get 15 strenght
Reach Zone 10
Open 10 chests
Get 5 wisdom
Get 5 dixterity
Get 5 strenght
Get level 20
Get level 10
Remove one lock
Collect 250 candles
Collect 500 candles
Kill 20 fireflies
Open 1 chest
Collect 100 Candles
Collect 50 Candles
Perform 1 ritual
Get level 5
Reach Zone 5
Click 500 times
Kill 1 champion