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.
Disintegrate 50 or more enemies.
Earn 45 stars.
Have your Paladins perform 100 Holy Strikes.
Defeat 10 Troll Pathfinders while they're treading on ice.
Have at least 3 Imperial Guards survive in the Citadel.
Kill 10 or more sheep with your hands.
Defeat Sarelgaz and its minions.
Hold 500 or more enemies with Wrath of the Forest.
Send 1.000 soldiers to their deaths.
Throw 500 or more axes.
Defeat Gul'Thak and its minions.
Snipe 50 enemies.
Defeat 9 legions before they replicate.
Complete the campaign.
Earn 30 stars.
Defeat Vez'nan.
Have your soldiers regenerate a total of 50.000 life.
Build 4 Tesla towers in any stage.
Have your Paladins heal a total of 7.000 life.
Kill 10.000 enemies.
Kill 300 enemies with electricity.
Build all 8 towers specializations.
Defeat J.T.
Train a hero up to max level.
Kill 100 enemies with meteor showers.
Kill 50 enemies by poison damage.
Defeat The Juggernaut
Earn 15 stars.
Use Rain of Fire 5 times in a single stage.
Build 150 towers.
Build 100 towers.
Upgrade all basic tower types to level3.
Build 30 towers.
Kill 2.500 enemies
Train a hero up to level 5.
Kill 500 enemies.
Call 10 waves early.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.
Open 5 information cards.
Change soldiers' rally point 200 times.
Train 1.00 soldiers.
Sell 30 towers.
Sell 5 towers in a single mission.
Recruit max elves at The Silveroak Outpost.
Free the sasquatch on the Icewind Pass.
Catch a fish.
Polymorph 50 enemies into sheep.
Have a single barbarian kill 10 enemies.
Drop 1.000 or more bomblets with the cluster bomb.
Summon 5 rock elementals in any one stage.
Shoot 100 missiles.
Teleport 250 or more enemies.
Complete all heroic stages.
Complete all iron stages.
Help Fredo escape.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
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 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.
Kill 15 Wererats before they sicken any soldier.
Complete the campaign in Veteran mode.
Fire the Sunray 20 times.