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