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