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