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