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