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