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