Here is the full list of all 12 Danger Zone achievements.
Score 10 platinum medals
Complete Tier 3
Score a medal on every simulation
Complete Tier 2
Complete Tier 1
Score over $20M in a single junction
Get your first Grand Slam bonus
Wreck 100 cars in a single junction
Get your first Smash and Grab bonus
Score a x15 or more Smashbreaker score
Earn your first gold medal
Fire your first smashbreaker