Here is the full list of all 20 Ferrum's Secrets: Where Is Grandpa? achievements.
Find your first collector's item.
Find all collector's item on normal difficulty level.
Find all collector's items.
Finish steam leakage mini-game.
Finish game on any difficulty level.
Finish game on extreme difficulty level.
Finish game on all difficulty levels.
Find all collector's items that are paintings.
Find 5 collector's items that are made of glass.
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.
Fly over the city using the aeroplane.
Find all grandpa's notes.
Find Lagrange family tree.
Find all scientists letters.
Finish all mini-games without using Skip button.
Finish game without using any source of light.
Finish game without finding any map.