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