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