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