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.
Complete all iron stages.
Complete all heroic stages.
Defeat Moloch the Demon Overlord.
Defeat 9 legions before they replicate.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.
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.
Discover the hidden monster under water.
Capture the attention of the mysterious crow.
Kill 15 Wererats before they sicken any soldier.
Do not let The Kingpin escape.
Defeat Ulguk-Hai the Troll Warlord.
Find the 5 legendary lost ice-shrooms.
Have your Elves deal 10000 points of damage.
Defeat Greenmuck and its minions.
Defeat 10 Troll Pathfinders while they're treading on ice.
Have your Paladins perform 100 Holy Strikes.
Teleport 250 or more enemies.
Earn 45 stars.
Sell 30 towers.
Summon 5 rock elementals in any one stage.
Change soldiers' rally point 200 times.
Defeat Gul'Thak and its minions.
Shoot 100 missiles.
Snipe 50 enemies.
Find the elusive acorn.
Defeat Sarelgaz and its minions.
Help Fredo escape.
Complete the campaign.
Defeat Vez'nan.
Polymorph 50 enemies into sheep.
Drop 1.000 or more bomblets with the cluster bomb.
Build all 8 towers specializations.
Have your Paladins heal a total of 7.000 life.
Have a single barbarian kill 10 enemies.
Kill 10.000 enemies.
Sell 5 towers in a single mission.
Earn 30 stars.
Hold 500 or more enemies with Wrath of the Forest.
Have your soldiers survive the explosion of 300 demons.
Train 1.00 soldiers.
Disintegrate 50 or more enemies.
Send 1.000 soldiers to their deaths.
Have your soldiers regenerate a total of 50.000 life.
Build 4 Tesla towers in any stage.
Kill 300 enemies with electricity.
Defeat J.T.
Throw 500 or more axes.
Kill 100 enemies with meteor showers.
Free the sasquatch on the Icewind Pass.
Kill 2.500 enemies
Upgrade all basic tower types to level3.
Build 150 towers.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Kill 50 enemies by poison damage.
Build 100 towers.
Earn 15 stars.
Recruit max elves at The Silveroak Outpost.
Train a hero up to max level.
Open 5 information cards.
Train a hero up to level 5.
Kill 500 enemies.
Use Rain of Fire 5 times in a single stage.
Build 30 towers.
Catch a fish.
Call 10 waves early.
Call a wave within 3 seconds of the icon showing up.
Kill 10 or more sheep with your hands.
Call all waves early in a single mission.
Kill one enemy.