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