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