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