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