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