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