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
Complete Level 7
Complete Level 6
Complete Level 5
Spoke perfectly
Complete Level 4
Drove 150 km per hour
Complete Level 3
Drink two cups of coffee
Didn't fall down the stairs
Made no stains on yourself
Complete Level 2
Skipped a cinematic
Complete Level 1
Tip Tony
Completed Sams house only breathing in 15 times
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
Went to work without shoes
Blow up Tony
Blink 2000 times
Didn't skip any cinematics
Found every hashtag