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.
Help Fredo escape.
Find the elusive acorn.
Defeat Vez'nan.
Shoot 100 missiles.
Drop 1.000 or more bomblets with the cluster bomb.
Earn 45 stars.
Snipe 50 enemies.
Have a single barbarian kill 10 enemies.
Have your soldiers survive the explosion of 300 demons.
Change soldiers' rally point 200 times.
Teleport 250 or more enemies.
Throw 500 or more axes.
Disintegrate 50 or more enemies.
Build 4 Tesla towers in any stage.
Hold 500 or more enemies with Wrath of the Forest.
Train 1.00 soldiers.
Kill 300 enemies with electricity.
Kill 10.000 enemies.
Build all 8 towers specializations.
Defeat J.T.
Have your Paladins heal a total of 7.000 life.
Earn 30 stars.
Sell 30 towers.
Have at least 3 Imperial Guards survive in the Citadel.
Have your Paladins perform 100 Holy Strikes.
Have your soldiers regenerate a total of 50.000 life.
Send 1.000 soldiers to their deaths.
Free the sasquatch on the Icewind Pass.
Recruit max elves at The Silveroak Outpost.
Defeat The Juggernaut
Kill 50 enemies by poison damage.
Build 150 towers.
Train a hero up to max level.
Kill 2.500 enemies
Upgrade all basic tower types to level3.
Kill 10 or more sheep with your hands.
Catch a fish.
Earn 15 stars.
Build 100 towers.
Kill 100 enemies with meteor showers.
Train a hero up to level 5.
Sell 5 towers in a single mission.
Open 5 information cards.
Use Rain of Fire 5 times in a single stage.
Build 30 towers.
Kill 500 enemies.
Call a wave within 3 seconds of the icon showing up.
Call 10 waves early.
Call all waves early in a single mission.
Kill one enemy.
Polymorph 50 enemies into sheep.
Summon 5 rock elementals in any one stage.
Complete the campaign.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Defeat Gul'Thak and its minions.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
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.
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.