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