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.
Change soldiers' rally point 200 times.
Catch a fish.
Help Fredo escape.
Earn 45 stars.
Find the elusive acorn.
Kill 10 or more sheep with your hands.
Defeat Gul'Thak and its minions.
Sell 30 towers.
Shoot 100 missiles.
Drop 1.000 or more bomblets with the cluster bomb.
Have your Paladins perform 100 Holy Strikes.
Build 4 Tesla towers in any stage.
Teleport 250 or more enemies.
Polymorph 50 enemies into sheep.
Train 1.00 soldiers.
Throw 500 or more axes.
Complete the campaign.
Defeat Vez'nan.
Summon 5 rock elementals in any one stage.
Have your Paladins heal a total of 7.000 life.
Disintegrate 50 or more enemies.
Kill 10.000 enemies.
Have your soldiers regenerate a total of 50.000 life.
Kill 300 enemies with electricity.
Build all 8 towers specializations.
Earn 30 stars.
Recruit max elves at The Silveroak Outpost.
Send 1.000 soldiers to their deaths.
Defeat J.T.
Hold 500 or more enemies with Wrath of the Forest.
Kill 50 enemies by poison damage.
Free the sasquatch on the Icewind Pass.
Train a hero up to max level.
Build 150 towers.
Sell 5 towers in a single mission.
Kill 2.500 enemies
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.
Train a hero up to level 5.
Kill 100 enemies with meteor showers.
Kill 500 enemies.
Build 30 towers.
Open 5 information cards.
Use Rain of Fire 5 times in a single stage.
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.
Have a single barbarian kill 10 enemies.
Complete all heroic stages.
Complete all iron stages.
Defeat Sarelgaz 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.
Have your soldiers survive the explosion of 300 demons.
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.