Doug Hates His Job

1st Achievement in the Game. However it IS MISSABLE.
To get it legit, you need to:
- Press A 13x to get to the 1st Dialogue Option (Marvel or DC)
- Select "DC"
- Now Josh will want to Fight you because he is a Marvel Fan
- We must Defeat him in a Bathroom Brawl
ACHIEVEMENT UNLOCKED

"Scene Select" Method:
You can insert the Cheat Code at the Title Menu
- Press A to go to the Screen that shows your Gamertag
- Now Press 10x and then Press
- This will Activate "Scene Select"
- The Bathroom Fight is SCENE 3
- Start it up and Defeat Josh
ACHIEVEMENT UNLOCKED

VIDEO GUIDE:
Time Stamp - 2:17

What Mastertimos says is 100% correct just adding the rest of the game choices below.

This is missable press B D.C A will skip the fight.

The Reponses you need to put in order are:

B - DC - Fan Boy
Street Fighter - Not Missable Level 1
B - Quit - Will Work For Coffee - (Restarts game)
A- Suck it up - A Quarter Mile at a Time
Either(Level isn't Missable) - No Respect
A - Try to sneak in(B skips level) - Lost Track of time
Either(level isn't missable) - Put the money in the bag
A- Actually I had a dream about printers - Down on a farm
A Unfortunately I already ate(B skips) - Movie Star
B - Umm I wonder what that would be like - There's Always room for zombies
Either - Fastest Gun in the west
Either - Mountain Man
A - Sounds Fun - Look at the brain on Doug
After Boss battle - Comeuppance

During the opening scene of the game, you're having a discussion with your colleague, Josh. When he asks if you prefer Marvel or DC movies, make sure you answer DC. This will trigger a fight scene against Josh and as soon as you beat him up, the achievement is yours.

Note: If you choose Marvel, you'll miss your chance to earn this achievement, but since it occurs within the first minute of the game, you can always start a new game and get it early on