Here is the full list of all 28 Robby's Adventure achievements.
After that he decides to commit suicide
Collect 1000 cogwheels
Find Super-Cogwheel.
Really?
Scan yourself.
Get a spring!
Get a plane!
Find a car
Get a tank!
Die 100 times
Complete all bonus levels
Complete New Year level
Open 30 presents
Collect 60 snowflakes
Launch a New Year Level
Launch a Halloween Level
Unlock 1 level from Group B
Escape the tank.
Collect 100 cogwheels
Fix the running
Push 5 items
Collect 70 Cogwheels
Get Screwdriver
Collect 50 Cogwheels
Collect 20 cogwheels
Die 1 time
Collect 10 cogwheels