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.
Complete all iron stages.
Complete all heroic stages.
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.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 10 Troll Pathfinders while they're treading on ice.
Do not let The Kingpin escape.
Earn 45 stars.
Defeat Sarelgaz and its minions.
Polymorph 50 enemies into sheep.
Defeat Gul'Thak and its minions.
Find the elusive acorn.
Help Fredo escape.
Shoot 100 missiles.
Drop 1.000 or more bomblets with the cluster bomb.
Snipe 50 enemies.
Build 4 Tesla towers in any stage.
Complete the campaign.
Defeat Vez'nan.
Hold 500 or more enemies with Wrath of the Forest.
Have your soldiers survive the explosion of 300 demons.
Kill 300 enemies with electricity.
Have a single barbarian kill 10 enemies.
Summon 5 rock elementals in any one stage.
Teleport 250 or more enemies.
Throw 500 or more axes.
Build all 8 towers specializations.
Earn 30 stars.
Kill 50 enemies by poison damage.
Have your Paladins heal a total of 7.000 life.
Train 1.00 soldiers.
Defeat J.T.
Disintegrate 50 or more enemies.
Send 1.000 soldiers to their deaths.
Train a hero up to max level.
Kill 10.000 enemies.
Have your soldiers regenerate a total of 50.000 life.
Free the sasquatch on the Icewind Pass.
Have your Paladins perform 100 Holy Strikes.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Sell 30 towers.
Build 150 towers.
Earn 15 stars.
Upgrade all basic tower types to level3.
Kill 2.500 enemies
Recruit max elves at The Silveroak Outpost.
Catch a fish.
Kill 10 or more sheep with your hands.
Change soldiers' rally point 200 times.
Build 100 towers.
Train a hero up to level 5.
Kill 100 enemies with meteor showers.
Sell 5 towers in a single mission.
Open 5 information cards.
Use Rain of Fire 5 times in a single stage.
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.