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