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