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