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