Here is the full list of all 16 Defect achievements.
Capture all platforms in Platform Capture
Unlock first super-sized core
Destroy both scrap collectors in Scrap
Scan the Deadly Dragon
Capture all platforms in Final Stand
Complete a racing mission
Keep all Pods alive in Lucky Horizon
Get to the scrap first and then destroy then scrap collector in Big Pile of Scrap.
Rescue all civilian transports in Rail Guns 101
Kill a Purple Core ship in Punch Stopper
Capture all the pods before the enemy in Tomahawk Express
Unlock first hyper-sized core
Survive 10 waves in Survival Challenge mode
Survive 20 waves in Survival Challenge mode
Capture the escape pod in Station Attack
Complete the last mission in the campaign