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