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