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