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