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