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