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