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