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