Firstly, create a new character with "Survival" difficulty. You won't need intro missions, so skip it.

Type "/admin" in the chat window for some extra items:

• 39 packs of 1000 blocks, and a little more to seal the spawn point.
  
• Some lava, put them into the small room until it's enough for drowning.
  
• Another 1000 blocks after deleting the lava. Now the backpack should be full.
  
• *sample code*
  
  • 1./spawnitem blaststone 1000 --repeat 40 times
    
  • 2./spawnitem liquidlava 1000
    
  • 3./spawnitem blaststone 1000

When everything is done, it should look like this:

next you'll need some special equipments

the code is like this:
/spawnitem firelordhead 1 '{"rarity":"Essential","statusEffects":[{"stat":"powerMultiplier","baseMultiplier":5.20},{"stat":"maxEnergy","amount":50},{"stat":"maxHealth","amount":-99},"burning"]}'

(Special thanks to Festive Loyalties's Guide)
(There's nothing but the maxHealth factor {"stat":"maxHealth","amount":-99} that matters. Everything else can be changed.)

Equipping this helmet will make the character's max health go down to 1.


Now you're prepared for the grinding.

Type "/admin" to cancel the invincible status, or just quit and reload. What to do next is just simply pressing "ESC" once the screen goes black.
Before I start writing his section, I opened Starbound and loaded my grinding savefile, and here's the result till then:

You could manually press ESC, or leave the game running in the background and do other things(like writing a guide)
--or use some auto-pressing ESC tools to press ESC about every 3 seconds.

Result updating:




update: you don't need to press ESC because the reviving animation won't influence the drop-and-pick cycle. It just helps checking how far you are from the achievement.

As we know, lava and poison can't deal continuous damage on board, so the character may drown in lava as in water.

However,when a character touch lava for the first time,there's a damage 30.

--then,what will happen if the character has less than 30 life?


Every time the player respawn, in the very first moment all the blocks are picked, and lava deals damage to the player, player dies, blocks drop, one cycle ends and you've picked another 40k blocks~

one cycle might be about 3-4 seconds, so 250 cycles for the achievement takes less than 30 minutes.