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