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