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