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