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