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