Here is the full list of all 35 Natti achievements.
Acquire equipment abilities 100 times.
Deal 1,000 or more damage in one hit.
Build a tower in every slot.
Defeat Mugi without using an archers tower.
Defeat Mugi the Imperfect one.
Upgrade 5 towers to final state in one battle.(excluding basic equipment)
Deal 10,000 DOT damage.
Learn all of Boozer’s skills.
Deal 10,000 critical damage.
Defeat Sinny the Skull crusher.
Acquire an equipment ability.
Upgrade a tower to final state in one battle. (excluding the basic equipment)
Lose a game at the first wave of the enemy.
Use player spells for 100 times.
Acquire 10 tower gears.
Use player spells for 10 times.
Defeat Summus the Beast master.
Clear a game.
Acquire 100 tower gears.
Defeat Sinny without using a magic tower.
Defeat Summus without using an artillery tower.
Upgrade 10 towers to final state in one battle. (excluding basic equipment)
Complete a game without losing any HP in battle.
Deal 100,000 DOT damage.
Deal 100,000 critical damage.
Deal 3,000 or more damage in one hit.
Level up boozer to max level.
Defeat Ziggy the Hellfire.
Defeat Ziggy without using an archer tower.
Upgrade a gear.
Upgrade gears of every type at least once.
Win an elite battle.
Win 5 elite battles in a single run.
Defeat Gwis the Walking mountain.
Defeat Gwis without using a magic tower.