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