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