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