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