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