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