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