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