Here is the full list of all 10 Bridge Constructor Stunts achievements.
Do 500 flips.
Destroy the pickup truck 250 times.
Gain 1000000 points through destruction.
Destroy 250 red explosive barrels.
Accumulate 1 hour of air time.
Do a 4x flip with the dump truck.
Collect 250 stars.
Collect 25 bolts.
Do a jump with 7 seconds of air time.
Do a 5x flip with the pickup truck.