Here is the full list of all 30 Ethan: Meteor Hunter achievements.
Complete a level without using any checkpoint returns and without dying
Finish a level without using a pause
Die 10x in the same level
Remain stuck on a puzzle for too long
Complete the three challenges in all levels
Complete the fragment challenge in all levels
Complete the pause challenge in all levels
Complete the time challenge in all levels
Find every french cheese
Spend a total of 60 minutes in pause mode
Collect a total of 1,000 fragments
88 miles per hour!
Finish all the levels in the sawmill
Finish all the levels in the cave
Finish all the levels in the greenhouse
Use 200 pause items
Burn 100 blocks of wood
Did you want to do that?
Jump 2000x!
Finish the three levels with the vessel
Finish the three pogo levels
Be propelled by air 50x
Get killed 20x by a mousetrap
Be propelled by a mousetrap 50x
Use it, that's what it's there for!
If you stack it up, will it still bounce?
Do you think you're an acrobat?
Use THE most secret code in the world
Destroy all the items in any level with the vessel
Get to the exit really very fast