Complete City area
Complete Amazon area
Complete Arctic area
Complete the Sandy area
Complete Planet XR12
Destroy your first building
Drive a Tank
Walk a Mech
Give a dog a bone
Take down a guard tower
Obtain a special tooth
Unlock all characters in a single game
Listen to a classic
Complete a hostage mission
Complete an espionage mission
Complete tower without alarms
Complete a sabotage mission
Silently take down 20 soldiers
Use the time machine
Fire a rocket launcher