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
Take the high road
Watch all seven endings
Reject the offer
Pull the trigger
Fall for the bluff
Watch four endings
Convince Parr it's a fake
Go to the Tchois
Go home alone
The key to friendship
Enter the wrong code
Defeat the odds
Accept the offer
Don't cross the line
Don't fight
Don't give in
More than just friends?
Split the share 50/50
What are the chances?