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