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