Destroy All Humans

Invade Turnipseed Farm

Invade Rockwell

Invade Santa Modesta

Invade Area 42

Invade Union Town

Invade Capitol City

Upgrade Crypto at Pox's Lab in the mothership

Upgrade your saucer at Pox's Lab in the mothership

Revisit a missionless invasion site and complete a challenge there

Try out a new look for Crypto in the mothership's archives

Re-visit a mission in the mothership archive's Holopoxdeck

Accelerate Brain Extract or Transmog by mashing that button like you mean it

Destroy a human with a weapon and another with a psi ability at the same time

Stay covert by scanning primitive human thoughts

Recover a Furon Probe

Throw something into something else with the saucer's Abducto Beam

Explore the more offbeat parts of the mothership

Transmogrify an object to replenish your ammunition

Evade a rocket by dashing

Consume a human brain to kickstart your shield regeneration

Use your saucer's Repulse-O-Tron to fend off homing missiles

Use PK to destroy a human with another human

Destroy multiple humans with a human-made explosive

Demonstrate Furon free spirit near a warning sign placed by the human authorities

Abduct a cow with your saucer

Throw a human into the air and juggle them

Destroy a certain irritating simian warlord once and for all

Destroy the pathetic human attempt at a robot overlord

Ace an Abduction challenge with a three-star rating

Ace a Race challenge with a three-star rating

Ace a Rampage challenge with a three-star rating

Ace an Armageddon challenge with a three-star rating

Obtain at least a two-star rating for each challenge type

Fully upgrade one of the branches of a weapon or ability

Destroy humanity's last hope and initiate the subjugation of the species