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