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