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