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