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