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