Here is the full list of all 74 Kingdom Rush achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Complete all iron stages.
Complete all heroic stages.
Have at least 3 Imperial Guards survive in the Citadel.
Have your Elves deal 10000 points of damage.
Defeat Moloch the Demon Overlord.
Defeat 9 legions before they replicate.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Defeat Greenmuck and its minions.
Defeat Lord Blackburn to avoid war between kingdoms.
Discover the hidden monster under water.
Capture the attention of the mysterious crow.
Kill 15 Wererats before they sicken any soldier.
Find the ninja master rat.
Defeat Gul'Thak and its minions.
Defeat Ulguk-Hai the Troll Warlord.
Find the 5 legendary lost ice-shrooms.
Find the elusive acorn.
Defeat 10 Troll Pathfinders while they're treading on ice.
Do not let The Kingpin escape.
Have your Paladins perform 100 Holy Strikes.
Earn 45 stars.
Snipe 50 enemies.
Defeat Sarelgaz and its minions.
Drop 1.000 or more bomblets with the cluster bomb.
Summon 5 rock elementals in any one stage.
Help Fredo escape.
Defeat Vez'nan.
Complete the campaign.
Complete the campaign in Veteran mode.
Polymorph 50 enemies into sheep.
Hold 500 or more enemies with Wrath of the Forest.
Shoot 100 missiles.
Have your Paladins heal a total of 7.000 life.
Kill 50 enemies by poison damage.
Teleport 250 or more enemies.
Kill 10.000 enemies.
Sell 30 towers.
Catch a fish.
Sell 5 towers in a single mission.
Have your soldiers survive the explosion of 300 demons.
Earn 30 stars.
Kill 300 enemies with electricity.
Build 4 Tesla towers in any stage.
Change soldiers' rally point 200 times.
Train 1.00 soldiers.
Build all 8 towers specializations.
Defeat J.T.
Fire the Sunray 20 times.
Throw 500 or more axes.
Have your soldiers regenerate a total of 50.000 life.
Send 1.000 soldiers to their deaths.
Build 150 towers.
Disintegrate 50 or more enemies.
Have a single barbarian kill 10 enemies.
Free the sasquatch on the Icewind Pass.
Upgrade all basic tower types to level3.
Defeat The Juggernaut
Kill 2.500 enemies
Kill 100 enemies with meteor showers.
Build 100 towers.
Earn 15 stars.
Call 10 waves early.
Recruit max elves at The Silveroak Outpost.
Train a hero up to max level.
Kill 10 or more sheep with your hands.
Train a hero up to level 5.
Open 5 information cards.
Use Rain of Fire 5 times in a single stage.
Kill 500 enemies.
Build 30 towers.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.