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