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