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