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