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