Notice: Undefined offset & Trying to get property of non-object - php

Question

I am trying to pull data from the json_decode array, I have done it before but this time I am getting extra issues.
This is what the json looks like.
{
"achievementpercentages": {
"achievements": [
{
"name": "TF_SCOUT_LONG_DISTANCE_RUNNER",
"percent": 54.668815612792969
},
{
"name": "TF_HEAVY_DAMAGE_TAKEN",
"percent": 47.104038238525391
},
{
"name": "TF_GET_CONSECUTIVEKILLS_NODEATHS",
"percent": 44.668777465820312
},
{
"name": "TF_PYRO_CAMP_POSITION",
"percent": 36.480117797851563
},
{
"name": "TF_KILL_NEMESIS",
"percent": 34.392494201660156
},
{
"name": "TF_BURN_PLAYERSINMINIMUMTIME",
"percent": 33.580135345458984
},
{
"name": "TF_PYRO_BURN_MEDICPAIR",
"percent": 32.748367309570312
},
And my code is basically this
$achName = $decodedAch->achievementpercentages->achievements[$achCounter]->name;
$achPercent = $decodedAch->achievementpercentages->achievements[$achCounter]->percent;
The $achCounter is present in a while statement, in an effort to get all the achievements seperately. I don't think that part is wrong, just how I am trying to access the data in the array. I don't see what is wrong with it though.
Any help would be appreciated.
FULL WHILE STATEMENT AS REQUESTED
while($achCounter < $responseCount)
{
$appid = $decodedSteam->response->games[$achCounter]->appid;
$achievementURL = 'http://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v0002/?gameid='.$appid.'&format=json';
$jsonAch = file_get_contents($achievementURL);
$decodedAch = json_decode($jsonAch);
//var_dump($decodedAch);
$achName = $decodedAch->achievementpercentages->achievements[$achCounter]->name;
$achPercent = $decodedAch->achievementpercentages->achievements[$achCounter]->percent;
//echo $achievementURL;
$sql = "INSERT INTO steamid".$steamid."(name, percent) VALUES ('".$achName."','".$achPercent."')";
$achCounter++;
}

Answer 1

You need to iterate again after you fetch data from your url. Your $achCounter is usefull only for $decodedSteam, not for $decodedAch:
while($achCounter < $responseCount)
{
$appid = $decodedSteam->response->games[$achCounter]->appid;
$achievementURL = 'http://api.steampowered.com/ISteamUserStats/GetGlobalAchievementPercentagesForApp/v0002/?gameid='.$appid.'&format=json';
$jsonAch = file_get_contents($achievementURL);
$decodedAch = json_decode($jsonAch);
//var_dump($decodedAch);
foreach($decodedAch->achievementpercentages->achievements as $achievement) { //HERE
$achName = $achievement->name;
$achPercent = $achievement->percent;
//echo $achievementURL;
$sql = "INSERT INTO steamid".$steamid."(name, percent) VALUES ('".$achName."','".$achPercent."')";
}
$achCounter++;
}