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