Full list of all 45 Grounded achievements worth 3,300 gamerscore. It takes around 0-0.5 hours to unlock all of the achievements in the base game on Xbox One.
The base game contains 20 achievements worth 1,000 Gamerscore, and there are 5 DLC packs containing 25 achievements worth 2,300 Gamerscore.
Kill the Broodmother
Tame a bug as a pet
Zip across a teen made Zipline longer than 100 cm
Kill your first Wolf Spider
Discover 20 Sites on the Map
Construct your first Mushroom Brick building
Consume 5 Beefy memorized recipe Smoothies
Obtain 10 new SCA.B color schemes
Craft your first Tier 3 item
Equip a matching set of Tier 2 armor
Perform 10 perfect blocks in a row
Lounge in a Chair
Score a basket with the Basketball Hoop from over 40 cm away
Cook a bug on the Roasting Spit
Analyze 15 resources
Obtain your first Mutation
Purchase your first upgrade from an ASL Station
Complete the Pond Lab
Complete the Hedge Lab
Save BURG.L after the Oak Tree Lab explosion
Craft tier 3 arrows
Snap a picture using Photo Mode
Kill a flying bug with an arrow from over 30 cm away
Upgrade a tier 3 item to the max level at the Smithing Station
Achieve level 10 Brainpower
Infuse yourself with 20 regular Milk Molars
Complete the Black Ant Hill Lab
Plug the Haze canister
Grow big again!
Grow big again and score 100% on the end game Report Card
Defend all of the MIX.Rs and Super MIX.Rs
Foil Director Schmector
Unlock every Creature Card
Successfully brew the Embiggening Cocktail
Kill the Mantis
Kill the Mant
Find Dr. Wendell Tully
Kill the Wasp Queen
Duplicate an item at the Super Duper
Unwind at a base while experiencing max coziness
Kill the Infected Broodmother
Complete BURG.L's list of Quests
Deal with all of the Ant Queens
Activate the REMIX.R
Grow big again after activating the REMIX.R