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