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