Hey Everyone
This is a (noob guide since im noob at writing and guiding)
How to get the Not A Chicken Achievement

*Note if you look on your map (tab) Then you can see sidemissions as a red/black Star with a "M" inside :)
So basicly in Zone 4 you start getting side missions at Ash 2.0 from the future.
You can then complete the 3 Side missions where he tell you to do something like " Lft Shft + F + E " for some seconds in the air.
After that you just gotta keep on going in the game till you reach zone 6 (The Psychedelic)
(The ultimate weird part of the game)
In that Zone you unluck the Teleport ability.

After that you can easily just go back and forth to places where you haven't been able to go.
Because doors will now be open when you get back to places (Because of the monster kill counter)

What i did was when i got the teleport, i ported back to the Zone 5 called "Space". Found the 3 side missions all the way to the left of the map.
6 out of 10 done now
Then i made sure i had enough monsters to the Zone 6 (Psychedelic) side missions. then i did those 3 :)
9 out of 10
Then i went back to Jails where you're supposed to go after getting the teleport,
Go there and then move on with the "diving" part .
Right before you end that Zone. there is a Ash 2.0 under the water
I did one of those and got the last one for the 10 :D
Just remember to keep an eye out on the map :) and go back to the places you havent been xD
Hope this helped you and you think its an okay guide for a 1st guide ever :D

*note* You can unlock things by doing side missions