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