Originally Posted by spxyu02
I never had this experience, and it may be obvious, but you have to buy every perk - getting a perk from knifing the goblin thingies doesn't count (although you seem to get that, stating you bought every perk twice).
Hope that helps.
[Update, I forgot] The final thing I did differently on my successful attempt was to not pick up any parts whatsoever. On my first attempt I had built the trample steam, but on my successful attempt I didn't pick up any keys or building pieces.
top of the quote. you can NOT get the achievement if you get a perk from the fleas. or whatever the fuck they are. you have to purchase every single perk from their respective machines.
As to not picking up any parts. It's irrelevant. I picked up a key (used to call the elevators) as well as completely built the trample steam in the same game that I unlocked the achievement in.