You unlocked all the islands.

You completed the mission "Roman's Sorrow".

You completed a 500 foot wheelie on a motorbike.

You beat a friend at pool.

You unlocked the special ability of Roman's taxi.

Clear a map without deploying a Thief or losing a single crystal.

Clear all the maps in W3.

Clear a single map without losing any crystals.

Clear a map with more than 10,000 points.

Clear all the maps in W1.

Clear wave 20 on any single map.

Awarded when you complete any Timed Challenge driving the Hawker Mech having used all 3 boost types

Awarded for winning any Offline Marked Man driving the Extreme Hot Rod