The following is the list of object IDs known so far to be recognized by AMPED mod, in alphabetical order:

$enemy_abomination
$enemy_bat
$enemy_blob
$enemy_blobelite
$enemy_blobtar
$enemy_boar
$enemy_deathsquito
$enemy_deer
$enemy_drake
$enemy_draugr
$enemy_draugrelite
$enemy_draugrspawner
$enemy_dvergr
$enemy_dvergr_mage
$enemy_fenring
$enemy_gjall
$enemy_goblin
$enemy_goblinbrute
$enemy_goblinshaman
$enemy_greydwarf
$enemy_greydwarfbrute
$enemy_greydwarfshaman
$enemy_greydwarfspawner
$enemy_greyling
$enemy_hare
$enemy_leech
$enemy_lox
$enemy_loxcalf
$enemy_neck
$enemy_seeker
$enemy_seekerbrute
$enemy_skeleton
$enemy_skeletonspawner
$enemy_stonegolem
$enemy_surtling
$enemy_tick
$enemy_troll
$enemy_ulv
$enemy_wolf
$enemy_wraith
$item_destructible_gucksack
$item_wolfhairbundle
$piece_deposit_copper
$piece_deposit_obsidian
$piece_deposit_silvervein
$piece_deposit_tin
$piece_giant_bone
$piece_giant_brain
$piece_giant_helmet
$piece_giant_sword
$piece_mudpile
$prop_beech
$prop_fir
$prop_treelog
$prop_treestump
$prop_yggashoot
AbandonedLogCabin02
AbandonedLogCabin03
AbandonedLogCabin04
BlueberryBush
CloudberryBush
Crypt2
Crypt3
Crypt4
Dolmen01
Dolmen02
Dolmen03
Dragonqueen
DrakeLorestone
DrakeNest01
Eikthyrnir
FireHole
GDKing
goblin_totempole
GoblinCamp2
Grave1
Greydwarf_camp1
hanging_hairstrands
Human
InfestedTree01
Mistlands_DvergrTownEntrance1
Mistlands_Excavation1
Mistlands_Excavation2
Mistlands_Excavation3
Mistlands_Giant1
Mistlands_Giant2
Mistlands_GuardTower1_new
Mistlands_GuardTower1_ruined_new
Mistlands_GuardTower2_new
Mistlands_GuardTower3_new
Mistlands_GuardTower3_ruined_new
Mistlands_Lighthouse1_new
Mistlands_RoadPost1
Mistlands_RockSpire1
Mistlands_Statue1
Mistlands_Statue2
Mistlands_StatueGroup1
Mistlands_Swords1
Mistlands_Swords2
Mistlands_Viaduct1
Mistlands_Viaduct2
MountainCave02
MountainGrave01
MountainWell1
Pickable_Barley_Wild
Pickable_BlackCoreStand
Pickable_Branch
Pickable_Dandelion
Pickable_DragonEgg
Pickable_DvergrLantern
Pickable_DvergrMineTreasure
Pickable_DvergrStein
Pickable_Fishingrod
Pickable_Flax_Wild
Pickable_Flint
Pickable_ForestCryptRemains01
Pickable_ForestCryptRemains02
Pickable_ForestCryptRemains03
Pickable_ForestCryptRemains04
Pickable_MeatPile
Pickable_MountainCaveCrystal
Pickable_MountainRemains01_buried
Pickable_Mushroom
Pickable_Mushroom_JotunPuffs
Pickable_Mushroom_Magecap
Pickable_Mushroom_yellow
Pickable_RoyalJelly
Pickable_SeedCarrot
Pickable_SeedTurnip
Pickable_Stone
Pickable_SurtlingCoreStand
Pickable_Tar
Pickable_TarBig
Pickable_Thistle
RaspberryBush
Ruin1
Ruin2
Ruin3
Runestone_BlackForest
Runestone_Boars
Runestone_Draugr
Runestone_Greydwarfs
Runestone_Meadows
Runestone_Mistlands
Runestone_Mountains
Runestone_Plains
Runestone_Swamps
ShipSetting01
ShipWreck01
StartTemple
StoneCircle
StoneHouse3
StoneHouse4
StoneTower1
StoneTower3
StoneTowerRuins03
StoneTowerRuins04
StoneTowerRuins05
StoneTowerRuins07
StoneTowerRuins08
StoneTowerRuins09
StoneTowerRuins10
SunkenCrypt4
SwampHut1
SwampHut2
SwampHut3
SwampRuin1
SwampRuin2
SwampWell1
TarPit1
TarPit2
TarPit3
TrollCave02
Vendor_BlackForest
Waymarker01
Waymarker02
WoodFarm1
WoodHouse1
WoodHouse10
WoodHouse11
WoodHouse12
WoodHouse13
WoodHouse2
WoodHouse3
WoodHouse4
WoodHouse5
WoodHouse6
WoodHouse7
WoodHouse8
WoodHouse9
WoodVillage1

Note: The list does not contain all creatures / mobs yet, just confirmed ones. AMPED still supports most of mobs, even if they are not listed here.