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