Originally Posted by spxyu02
When I got it right after it failed to pop, my differences were:
1. Had been in Local/easy, switched to Public/easy/custom (invite only)
2. Had done the PaP last, this time it was the penultimate machine I visited. I successfully popped the achievement when I finished with Double Tap instead.
3. I PaP'd my starting pistol. I highly doubt that had anything to do with it, but my PDW was full on ammo so I never bought a second gun from a wall, affording me the opportunity to experiment and PaP the 1911 >> Mustang & Sally.
4. Finally, 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.
Lol, I'm just dropping by from the PS3 version of this site xD I have the same problem on the PS3, I also finished with PaP last... Thanks for your tips, I'll try it!