No missable achievements (plus 20 unknown)
Sign in with Steam or Xbox to track your progress, and:
Find your first collector's item.
Finish steam leakage mini-game.
Chase a spider in the grandpa's basement.
Feed Blacky, grandpa's kitten.
Find water of life in Doris' house.
Find Fatal Blast project payroll list.
Find all grandpa's notes.
Fly over the city using the aeroplane.
Find Lagrange family tree.
Find all scientists letters.
Finish game on any difficulty level.
Finish all mini-games without using Skip button.
Find all collector's item on normal difficulty level.
Finish game without finding any map.
Finish game without using any source of light.
Find 5 collector's items that are made of glass.
Find all collector's items that are paintings.
Find all collector's items.
Finish game on extreme difficulty level.
Finish game on all difficulty levels.