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