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