Here is the full list of all 34 FTD2 achievements.
Sell a tower for gold.
Upgrade any tower to Level 2
Damage monsters with every type of tower
All your souls have been lost from the level.
Upgrade a tower to Level 3.
Kill either a Troll, Ogre or Cyclop.
Kill each of the following monsters. Troll, Ogre and Cyclop.
Use the quick cash soul skill.
Use the Acid Rain soul skill.
Use the Rockfall soul skill
Use the explosion soul skill
Use the extra money for kills soul skill
Complete a level on Tough Campaign Mode
Complete a level on Single Core Game Mode
Complete a level on No Soul Skills Game Mode
Do a total of one million damage
Do a total of ten million damage
Complete a level on Marathon Game Mode
Complete a level on Mega Marathon Game Mode
Do a total of one million damage with Crossbow Towers
Do a total of one million damage with Flamer Towers
Do a total of one million damage with Cannon Towers
Do a total of one million damage with Crystal Towers
Do a total of one million damage with Launcher Towers
Do a total of one million damage with Mortar Towers
Do a total of one million damage with Tesla Towers
Do a total of ten million damage with Crossbow Towers
Do a total of ten million damage with Flamer Towers
Do a total of ten million damage with Cannon Towers
Do a total of ten million damage with Crystal Towers
Do a total of ten million damage with Launcher Towers
Do a total of ten million damage with Mortar Towers
Do a total of ten million damage with Tesla Towers
Do a total one billion damage