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