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