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