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