Here is the full list of all 77 Revenge of the Titans achievements.
Got $25,000 in the bank
Fried 500 Titans with the Capacitor
Fried 250 Titans with the Capacitor
New rank: lieutenant general
Made $5,000 profit from one mission
Fried 100 Titans with the Capacitor
Used the shield powerup 5 times
Completed the Saturn missions
Destroyed a Behemoth
Vanquished 5,000 Titans
Fully upgraded a turret
Researched all turret upgrades
New rank: major general
Base held together with tape and string at end of mission
Researched all weapons
Researched all defenses
Researched the droid factory
Researched all explosive tech
Turned 100 3-D Titans into 2-D Titans
Researched the decoy tower
Lost 90% of your buildings to the enemy
Squished 50 Titans under new buildings
Crushed 25 Titans under new buildings
Lost 100 buildings to the enemy
Blew up 500 Titans using explosives
Nuked 100 Titans from orbit
Blew up 250 Titans using explosives
Nuked the site from orbit 5 times
Completed the Mars missions
Used bezerk powerup 5 times
Destroyed a Gargantuan
Researched nuclear reactors
Blew up 100 Titans using explosives
Giant Titan killed within a few metres of the base
Used the freeze powerup 5 times
Vanquished 2,500 Titans
Repaired your buildings 5 times
Made $15,000 profit from one mission
Got $10,000 in the bank
New rank: colonel
New rank: brigadier
Hurrah! Christmas is finally over!
Lost 50 buildings to the enemy
Defeated 2 Xmas Ultrayetis
Nuked 50 Titans from orbit
Defeated 1 Xmas Ultrayeti
Lost 25 buildings to the enemy
Completed the Moon missions
Destroyed a Leviathan
Lost 10 buildings to the enemy
Vanquished 1,000 Titans
New rank: lieutenant colonel
New rank: major
Completed the Earth missions
Completed whole world at maximum difficulty
Got $5,000 in the bank
New rank: captain
Defeated a Megatitan
Vanquished 500 Titans
New rank: lieutenant
Vanquished 250 Titans
Vanquished 100 Titans
New rank: second lieutenant
New rank: warrant Officer
Destroyed the Ultratitan!
Completed the Titan missions
Completed all missions at maximum difficulty
Vanquished 10,000 Titans
Nuked 250 Titans from orbit
Researched all science and technology
Researched everything
Made $10,000 profit from one mission
Got $50,000 in the bank
New rank: general
New rank: field marshal
Defeated 3 Xmas Ultrayetis
Defeated 4 Xmas Ultrayetis