no AWD has nothing to do with needing a 4 wheel alignment. Though our cars do have a limited amount of alignment adjustments in the rear, the most noticeable change will be the front alignment. Bump steer can be reduced or exacerbated based on your front end alignment.
Is your car lowered? The change in suspension geometry from lowering too much will cause bad bump steer. toe out, and inadequate caster can cause the car to have bad bumpsteer and not want to track straight as well. did the shop give you a print out with the post alignment specs? I would bring it back and ask them to possibly set the toe in a little bit (caster is non adjustable without aftermarket components), because the car drives unpredictably after their alignment.