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.
Snipe 50 enemies.
Build 4 Tesla towers in any stage.
Change soldiers' rally point 200 times.
Kill 50 enemies by poison damage.
Help Fredo escape.
Find the elusive acorn.
Sell 30 towers.
Disintegrate 50 or more enemies.
Throw 500 or more axes.
Teleport 250 or more enemies.
Hold 500 or more enemies with Wrath of the Forest.
Earn 30 stars.
Kill 10.000 enemies.
Sell 5 towers in a single mission.
Complete the campaign.
Defeat Vez'nan.
Have your soldiers survive the explosion of 300 demons.
Summon 5 rock elementals in any one stage.
Polymorph 50 enemies into sheep.
Have your soldiers regenerate a total of 50.000 life.
Train 1.00 soldiers.
Kill 300 enemies with electricity.
Build all 8 towers specializations.
Defeat J.T.
Send 1.000 soldiers to their deaths.
Free the sasquatch on the Icewind Pass.
Have a single barbarian kill 10 enemies.
Build 150 towers.
Kill 2.500 enemies
Kill 100 enemies with meteor showers.
Have your Paladins heal a total of 7.000 life.
Have your Paladins perform 100 Holy Strikes.
Have at least 3 Imperial Guards survive in the Citadel.
Defeat The Juggernaut
Build 100 towers.
Earn 15 stars.
Upgrade all basic tower types to level3.
Recruit max elves at The Silveroak Outpost.
Kill 10 or more sheep with your hands.
Train a hero up to max level.
Catch a fish.
Train a hero up to level 5.
Use Rain of Fire 5 times in a single stage.
Open 5 information cards.
Build 30 towers.
Kill 500 enemies.
Call 10 waves early.
Call all waves early in a single mission.
Call a wave within 3 seconds of the icon showing up.
Kill one enemy.
Earn 45 stars.
Drop 1.000 or more bomblets with the cluster bomb.
Shoot 100 missiles.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz and its minions.
Defeat Gul'Thak and its minions.
Defeat Greenmuck and its minions.
Do not let The Kingpin escape.
Defeat 10 Troll Pathfinders while they're treading on ice.
Find the 5 legendary lost ice-shrooms.
Defeat Ulguk-Hai the Troll Warlord.
Defeat 9 legions before they replicate.
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.