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