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