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