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