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 the campaign in Veteran mode.
Complete all iron stages.
Complete all heroic stages.
Discover the hidden monster under water.
Capture the attention of the mysterious crow.
Find the ninja master rat.
Find the 5 legendary lost ice-shrooms.
Help Fredo escape.
Find the elusive acorn.
Snipe 50 enemies.
Shoot 100 missiles.
Drop 1.000 or more bomblets with the cluster bomb.
Teleport 250 or more enemies.
Kill 50 enemies by poison damage.
Throw 500 or more axes.
Free the sasquatch on the Icewind Pass.
Summon 5 rock elementals in any one stage.
Polymorph 50 enemies into sheep.
Kill 10 or more sheep with your hands.
Catch a fish.
Have your Elves deal 10000 points of damage.
Recruit max elves at The Silveroak Outpost.
Sell 30 towers.
Sell 5 towers in a single mission.
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.
Kill 15 Wererats before they sicken any soldier.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 10 Troll Pathfinders while they're treading on ice.
Defeat Sarelgaz and its minions.
Earn 45 stars.
Do not let The Kingpin escape.
Defeat Gul'Thak and its minions.
Kill 100 enemies with meteor showers.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Complete the campaign.
Defeat Vez'nan.
Build 4 Tesla towers in any stage.
Have your Paladins perform 100 Holy Strikes.
Build all 8 towers specializations.
Call 10 waves early.
Use Rain of Fire 5 times in a single stage.
Have your soldiers survive the explosion of 300 demons.
Hold 500 or more enemies with Wrath of the Forest.
Kill 300 enemies with electricity.
Have your Paladins heal a total of 7.000 life.
Change soldiers' rally point 200 times.
Earn 30 stars.
Defeat J.T.
Disintegrate 50 or more enemies.
Have a single barbarian kill 10 enemies.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Have your soldiers regenerate a total of 50.000 life.
Upgrade all basic tower types to level3.
Send 1.000 soldiers to their deaths.
Train 1.00 soldiers.
Earn 15 stars.
Build 150 towers.
Train a hero up to max level.
Kill 10.000 enemies.
Build 100 towers.
Open 5 information cards.
Train a hero up to level 5.
Kill 2.500 enemies
Build 30 towers.
Kill 500 enemies.
Kill one enemy.