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