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.
Complete all heroic stages.
Defeat Lord Blackburn to avoid war between kingdoms.
Discover the hidden monster under water.
Defeat Moloch the Demon Overlord.
Defeat Myconid, the Rotten Fungus.
Kill 25 Shrooms without them poisoning your soldiers.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
Defeat Sarelgaz and its minions.
Fire the Sunray 20 times.
Have your Elves deal 10000 points of damage.
Capture the attention of the mysterious crow.
Shoot 100 missiles.
Build 4 Tesla towers in any stage.
Polymorph 50 enemies into sheep.
Summon 5 rock elementals in any one stage.
Have a single barbarian kill 10 enemies.
Find the ninja master rat.
Drop 1.000 or more bomblets with the cluster bomb.
Kill 15 Wererats before they sicken any soldier.
Defeat Gul'Thak and its minions.
Kill 50 enemies by poison damage.
Have your Paladins perform 100 Holy Strikes.
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.
Complete all iron stages.
Defeat 9 legions before they replicate.
Help Fredo escape.
Complete the campaign.
Defeat Vez'nan.
Snipe 50 enemies.
Free the sasquatch on the Icewind Pass.
Throw 500 or more axes.
Have your soldiers survive the explosion of 300 demons.
Sell 30 towers.
Earn 45 stars.
Hold 500 or more enemies with Wrath of the Forest.
Build all 8 towers specializations.
Kill 10.000 enemies.
Train 1.00 soldiers.
Change soldiers' rally point 200 times.
Sell 5 towers in a single mission.
Kill 300 enemies with electricity.
Teleport 250 or more enemies.
Catch a fish.
Earn 30 stars.
Defeat J.T.
Have your Paladins heal a total of 7.000 life.
Kill 100 enemies with meteor showers.
Have your soldiers regenerate a total of 50.000 life.
Kill 10 or more sheep with your hands.
Disintegrate 50 or more enemies.
Send 1.000 soldiers to their deaths.
Upgrade all basic tower types to level3.
Build 150 towers.
Kill 2.500 enemies
Call a wave within 3 seconds of the icon showing up.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Build 100 towers.
Use Rain of Fire 5 times in a single stage.
Earn 15 stars.
Recruit max elves at The Silveroak Outpost.
Train a hero up to max level.
Train a hero up to level 5.
Build 30 towers.
Open 5 information cards.
Call 10 waves early.
Kill 500 enemies.
Call all waves early in a single mission.
Kill one enemy.