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 Lord Blackburn to avoid war between kingdoms.
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.
Discover the hidden monster under water.
Defeat Ulguk-Hai the Troll Warlord.
Snipe 50 enemies.
Find the 5 legendary lost ice-shrooms.
Defeat 10 Troll Pathfinders while they're treading on ice.
Defeat Sarelgaz and its minions.
Earn 45 stars.
Do not let The Kingpin escape.
Summon 5 rock elementals in any one stage.
Defeat Greenmuck and its minions.
Capture the attention of the mysterious crow.
Kill 15 Wererats before they sicken any soldier.
Find the ninja master rat.
Shoot 100 missiles.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat 9 legions before they replicate.
Help Fredo escape.
Find the elusive acorn.
Sell 5 towers in a single mission.
Defeat Gul'Thak and its minions.
Build 4 Tesla towers in any stage.
Recruit max elves at The Silveroak Outpost.
Change soldiers' rally point 200 times.
Sell 30 towers.
Drop 1.000 or more bomblets with the cluster bomb.
Complete the campaign.
Defeat Vez'nan.
Have your Paladins perform 100 Holy Strikes.
Have your Paladins heal a total of 7.000 life.
Earn 30 stars.
Kill 300 enemies with electricity.
Have a single barbarian kill 10 enemies.
Have your soldiers survive the explosion of 300 demons.
Kill 50 enemies by poison damage.
Train 1.00 soldiers.
Polymorph 50 enemies into sheep.
Hold 500 or more enemies with Wrath of the Forest.
Build all 8 towers specializations.
Defeat J.T.
Kill 10.000 enemies.
Throw 500 or more axes.
Have your soldiers regenerate a total of 50.000 life.
Send 1.000 soldiers to their deaths.
Free the sasquatch on the Icewind Pass.
Teleport 250 or more enemies.
Disintegrate 50 or more enemies.
Build 150 towers.
Defeat The Juggernaut
Kill 2.500 enemies
Build 100 towers.
Earn 15 stars.
Train a hero up to max level.
Kill 100 enemies with meteor showers.
Upgrade all basic tower types to level3.
Train a hero up to level 5.
Use Rain of Fire 5 times in a single stage.
Open 5 information cards.
Catch a fish.
Build 30 towers.
Kill 500 enemies.
Call 10 waves early.
Kill 10 or more sheep with your hands.
Call all waves early in a single mission.
Kill one enemy.
Call a wave within 3 seconds of the icon showing up.
Complete all heroic stages.
Complete all iron stages.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.