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