ok so i got the Spider Mech, Spider Mech achievement and...

[Leded]

actually partially surprised/disappointed what is that... surprisapointed? . but i started up my game on the look out what what i assume were Spider Mech attackers. Rita goes on expedition and poof, i got it because of her ability to observe random "thing" on an expedition. i did not know you could get it that way lol.
now all i have left to get 8 survivors achievement then i will consider the game "beaten the crap out of"