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