Complete Red and Hidden Achievements Guide
Play of the Game
In the RPE + TB route, choose 'Sword Forme', then 'Absorb' - on the fail for 'Absorb', click 'Play Of The Game' in the fail text, watch the cutscene and you will get the achievement.
On the GSPI + PD route, choose 'Trash Ball', then 'Hot Knife' - on the fail for 'Hot Knife', click the fail text 'Butterfingers' and you will get the achievement.
On the RBH + GI route, choose 'Magic Spell', then pick 'Lockpick' 6 times - this will net you a fail, a new Bio (if you're fast enough to click) and the achievement.
This is Fun
On the GSPI + CA route, choose the Jetpacks (far right option), then click 'Swap' 6 times - this will lead to a brief scene with Charles commenting, followed by the achievement.
On the RPE + PD route; 'Abuse Physics Engine' -> 'Lagswitch' -> 'Walkthrough', and click the tank logo in the top left corner. It takes minimum 15 seconds (from my experience) before it will fail you + give the achievement.
Brryyess [Hidden 1]
On the RBH + CA route; 'Fire' -> 'Fulton' -> 'Wombo Combo' - then, when watching the credits, click the sun to get the achievement.
Respects [Hidden 2]
On the GSPI + GI route, pick 'Magic Hat', then 'Mannequin'. When the fail screen says 'Press F to pay Respects', press the F key on your keyboard and you should receive the achievement.
Multiverse Correction [Hidden 3]
Painstaking, but you need to get all the Fails and Bios in every game. In other words, 100% the collection. It may be necessary to reload the game after you've done so, but once finished, go back to the RPE + PD route, skip back to the 'CCC Mobile Unit' section and click past the sticky notes saying 'secret' - if you've got everything, you should see a button that will display a cutscene, a thank you note from PuffballsUnited and finally the achievement.
Now, i saw a guide earlier that helped me get the stuffed animals for the 'Assemble the Crew' achievement, but for sake of ease, i'll put it in terms of route combinations for specific colours:
- GSPI + GI [CeO]: you can find the Yellow stuffie after the 'Free Transform' QTE choice, then the Purple stuffie after choosing 'Leafmode'.
- GSPI + CA [TT]: Brown stuffie after the 'Umbrella' choice.
- GSPI + PD [VH]: Cyan stuffie after you click the 'Luxury'  pod.
- PBT + GI [JB]: Purple stuffie in one of the upper pods after the 'Teleporter' option is chosen.
- PBT + PD [SSR]: stuffie inside the truck after the 'Stop' QTE choice is picked.
- RBH + GI [FM]: White stuffie floating around after the 'Remote' option is picked.
- RBH + CA [CG]: Orange stuffie in the coin pile after 'Fire'.
- RBH + IRO [MBH]: Red stuffie after the 'Convert' choice.
- RPE + GI [TCW]: Pink stuffie in the electric tunnel during 'Midnight Surprise'.
- RPE + PD [T4L]: Cyan stuffie under the 'Phantom' sniper after picking the top left option in the CCC.
- RPE + TB [R]: there's a Black stuffie near Henry in the intro cutscene when he's woken up.
Note: There is also a fake grey stuffie if you click the one that pops out after 'Trash Ball' on the GSPI + PD - this does not count towards the achievement.