The Classified Projects Add-on for Retro Vaders: Reloaded has 16 achievements.
Purchase the "Classified Projects" DLC
Fully Upgrade the "Zapper Blaster" during any mission
Fully Upgrade the "Seeker Blaster" during any mission
Fully Upgrade the "Bounce Blaster" during any mission
Purchase the "Retro Shields" during any mission
Purchase the "Rebound Shields" during any mission
Purchase the "Recharge Shields" during any mission
Complete "Operation: First Contact" in Normal Mode
Complete "Operation: Homebound" in Normal Mode
Complete "Operation: First Contact" in 150 seconds or less (in Time Attack Mode)
Complete "Operation: Homebound" in 240 seconds or less (in Time Attack Mode)
Complete "Operation: First Contact" in Deathwish Mode
Complete "Operation: Homebound" in Deathwish Mode
Fully Upgrade the Zapper, Seeker and Bounce blasters atleast once
Unlock every other achievement in the "Classified Projects" DLC
Unlock every achievement in the basegame and the "Classified Projects" DLC