Here is the full list of all 20 Late Shift achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
Find all main chapters
Don't give in
Take the high road
Watch all seven endings
Accept the offer
Pull the trigger
Go to the Tchois
Enter the wrong code
Watch four endings
Go home alone
Convince Parr it's a fake
Fall for the bluff
Don't cross the line
The key to friendship
Defeat the odds
Reject the offer
Don't fight
More than just friends?
Split the share 50/50
What are the chances?