Here is my 100% Achievement guide for the DLC!
This takes slightly longer than the "Main Game" (Main game on the xbox anyway)
Takes around 1 and a half hours to complete!
Hope this helps and timestamps below the video :)
Episode 1 Start - 1:35
1. Laughing Stock - 6:40
2. Photo Development 101 - 15:10 Start/17:30 Finish
3. Forging Documents Is Hard Work - 19:05 Start/26:00 Finish
4. Excelsior - 26:30
Episode 2 Start - 27:45
5. DeeDee Dont Touch The Button - 37:15
6. Oops! You Missed A Spot! - 45:50
7. Oh Snap! - 55:40
8. The Fifth Element - 59:10
Episode 3 Start - 1:03:10
9. Its Not Gonna Rain! - 1:04:10
10. The Mechanist! - 1:19:50 Start/1:26:40 Finish (Includes getting 4 keys and long unskippable cutscene)
11. You Got Served, Lawrence - 1:29:40
12. Drinkindor! - 1:31:15
13. True Colours! (Make sure to have picked up red cloth and/or sword in the same room first) - 1:33:20