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