Here is the full list of all 24 Coalhero achievements.
Please use the pickaxe properly
Knocking Coal for the first time
Miner's Manual
Miner's respirator
Collect 10 Coal
Collect 20 Coal
Not at home crisis
Please be careful when using elevators
superficial
Beaten by a bat
Hit by falling rocks
What's the secret of the elevator switch
The second level did not trigger the water layer event
There are always surprises in the mine
Can't leave seniors alone
Senpai seems to have said
Attack the dead slime
There are supplies for the third level
Teaching by novice
Pass the first level
Pass the second level
Pass the third level
Pass the fourth level
Congratulations