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