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