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