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