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