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