Here is the full list of all 28 Manual Samuel achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Unlock all the Achievements in Manual Samuel
Get gold on every time trial
Found every hashtag
Went to work without shoes
Completed Sams house only breathing in 15 times
Complete Story Mode Co-Op
Get silver or higher on every time trial
Get bronze or higher on every time trial
Blink 2000 times
Kill every robot
Didn't fall down the stairs
Made no stains on yourself
Drove 150 km per hour
Skipped a cinematic
Complete Story Mode Single Player
Complete Level 8
Didn't skip any cinematics
Blow up Tony
Complete Level 6
Complete Level 5
Spoke perfectly
Complete Level 4
Complete Level 3
Drink two cups of coffee
Complete Level 2
Complete Level 1
Tip Tony
Complete Level 7