Hmmm, well I guess I must have been wrong with my statement, sorry if I might have caused any trouble with this.
I got my information from the Piggybank Guide. The guide says clearly that using any pivot hack will prevent you from being able to obtain achievements. But on the other hand the guide could also be wrong, as it's often the case with Piggybank Guides ...
100% Retail Games incl. all DLC:
GTA 5 * Far Cry 3 * Assassin's Creed 3, 2, 1 * L.A: Noire * Red Dead Redemption * Dead Rising 2, Case West, Case 0 * Mafia II * Alan Wake * Bioshock * Bully * Beautiful Katamari