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