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