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