If you play Kingdom Rush on the IronHide website site, there are achievements that you can get by playing this game. Some are easy to get and others require several playthroughs or specific knowledge of how to do them. If you play on Kongregate these are available as well but getting them doesn’t count toward your score there, they have their own achievements.
These are the first 26 achievements you can get. The majority of them are easy to get.
FIRST BLOOD Kill one Enemy.
DARING Call 10 early waves.
CONSTRUCTOR Build 30 Towers.
BLOODLUST Kill 500 Enemies.
ARMAGGEDON Use Rain of Fire 5 times in a single stage.
HOME IMPROVEMENT Upgrade all basic Tower types to level 3.
STARRY Earn 15 Stars.
WHATS THAT? Open 10 Enemy information cards.
SUPERMARIO Earn 30 Stars.
NUTS AND BOLTS Defeat The Juggernaut.
ENGINEER Build 100 Towers.
IS HE DEAD YETI? Defeat J.T.
SLAYER Kill 2500 Enemies.
DEATH FROM ABOVE Kill 100 Enemies with Meteor Shower.
TACTICIAN Change Soldiers rally point 200 times.
SUPERSTAR Earn 45 Stars.
THE ARCHITECT Build 150 Towers.
THIS IS THE END! Defeat Vez’nan.
TERMINATOR Kill 10,000 Enemies.
DIE HARD Have your Soldiers regenerate a total of 50,000 life.
G.I JOE Train 1,000 Soldiers.
CANNON FODDER Send 1,000 Soldiers to their deaths.
FEARLESS Call all waves early in a single mission.
REAL ESTATE Sell 30 Towers.
INDECISIVE Sell 5 Towers in a single mission.
IMPATIENT Call an early wave within 3 seconds of the icon showing up.
Thanks to the Kingdom Rush wikia for posting this.