Save for the first time

Kill your first non-tutorial enemy

Consume your first non-tutorial enemy

Break your first blockade

Get your first upgrade

Complete the first level

Complete the second level

Found all the upgrades

Consume your first non-tutorial healer

Throw your first bomber against an enemy

Defeat the excavator with the same or more alien's health you started the battle with

Defeat the scientist with the same or more alien's health you started the battle with

Kill two enemies with one shot

Defeat the excavator in less than 2 min and 40 sec

Defeat the scientist in less than 3 min

Destroy a barrel hitting it with a bomber

Burn 50 enemies

Shock 50 enemies with electricity