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