Happened to me too. I already have the achievement, but I couldn't get Kriegs head to spawn in the shops on my Assassin. So I started the DLC with Krieg to see if that worked and had to earn some tokens on that character. When I got to tier 3 everyone was 61 and I was somewhere around 35.
I heard they scaled tier 3 so people couldn't farm torgue tokens as easy if you were playing as a 61 but I don't think its supposed to be like that if you're lower level.