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