Here is the full list of all 20 Relive achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Stay a while and listen
Find all secrets in the fourth Story level
Find all secrets in all levels
Yeah, no problem, it's not like you are all going to die or something!
Find all secrets in the third Story level
Not as bloody as you expected
Don't be sad!
Complete the fourth Story level
Complete the third Story level
Save the Devs from certain death :D
Find all secrets in the second Story level
This stuff works IRL!
Complete the second Story level
You wouldn't download a martian AI
The old school way
Find all secrets in the first Story level
At least they didn't fall out of my pocket
Complete the first Story level
Confirmed... to be your best friend!
Launch a training session