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