Here is the full list of all 58 Mos Speedrun 2 achievements.
Collect first skull
Collect 6 skulls
Collect 20 Skulls
Collect 30 Skulls
Complete the first level
Complete 6 levels
Complete 12 levels
Complete 18 levels
Complete 24 levels
Complete 30 levels
Collect all coins from a single level
Collect all coins from 6 levels
Collect all coins from 30 levels
Collect 100 individual coins
Collect 500 individual coins
Collect 1000 individual coins
Collect all coins from 20 levels
Play for 1 hour
Play for 2 hours
Play for 5 hours
Die for the first time
Die 50 times
Die 100 times
Die in water 5 times
Die in slime 5 times
Die in gas 5 times
Die in lava 5 times
Die in lava 15 times
Get crushed 5 times
Get killed by an enemy 5 times
Get killed by an enemy 100 times
Collect a day charm
Collect 10 day charms
Collect 20 day charms
Collect 29 day charms
Collect 30 day charms
Change costume for the first time
Play a prestige game
Play 10 prestige games
Get to stage 6 in prestige
Run 1 km
Run 5 Km
Run 10 km
Swim 1 km
Fall 1 km
Fall 3 km
Jump 1000 times
Jump 5000 times
Wall jump 100 times
Wall jump 1000 times
Get all achievements
Lead eye spirit to the carving
Hear the number station
Enter the code correctly
Enter a warp tunnel for the first time
Complete the final puzzle