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